Feature W02: Drinking Water Quality in the WELL Building Standard focuses on ensuring the safety and quality of drinking water through regular testing for specific contaminants. The inclusion of arsenic, nickel, total chlorine, and nitrite as parameters for testing under this feature is based on their potential health impacts and the importance of maintaining them within safe limits. Arsenic and nickel are heavy metals that can be toxic at high concentrations, while total chlorine and nitrites are chemical parameters that can indicate water treatment effectiveness and potential contamination. Monitoring these parameters helps ensure that the water meets safety standards, protecting the health of building occupants. This approach is part of WELL's broader commitment to enhancing health and wellness through the built environment, ensuring that fundamental needs such as clean drinking water are adequately addressed.